Battery case, battery cell and battery

Abstract

The utility model provides a battery shell, a single battery and a battery, at least one heat conduction part is arranged in the battery shell, the interior of the battery shell is divided into at least two accommodating cavities by the at least one heat conduction part, and each accommodating cavity is used for accommodating an electrode assembly. In practical application, the electrode assembly is arranged in the containing cavity, the temperature of the electrode assembly located in the containing cavity can be effectively reduced through the arrangement of the heat conduction part, the service life of the electrode assembly is prolonged, meanwhile, the two adjacent containing cavities are communicated so that electrolyte in the adjacent containing cavities can circulate mutually, and the service life of the electrode assembly is prolonged. Furthermore, the quantity of the electrolyte in the adjacent accommodating cavities is kept consistent, the capacity consistency of the electrode assemblies in the adjacent accommodating cavities is improved, and in addition, the heat conduction part is arranged between the two adjacent electrode assemblies, so that the firmness of fixing the electrode assemblies in the battery shell can be improved, and the shaking of the electrode assemblies is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery housing, a battery cell, and a battery. Background Art

[0002] The charging and discharging process of a battery is a series of complex chemical reaction processes, and all chemical reaction processes are accompanied by heat transfer. Therefore, a large amount of heat is generated during the charging and discharging process of the battery, causing the battery temperature to rise, and it is necessary to dissipate heat and cool it. If the heat dissipation and cooling are not timely, it will cause local overheating of the battery, reducing its service life, and even causing fire or explosion.

[0003] Currently, for batteries, especially large-sized batteries, although air cooling and water cooling are used for cooling, the cooling efficiency is low, the temperature rise rate of the battery cells is relatively large, affecting the stability of battery performance and shortening the battery life. Summary of the Utility Model

[0004] In view of this, the purpose of the present application is to provide a battery housing, a battery cell, and a battery to solve or partially solve the problems raised in the background art.

[0005] Based on the above purpose, in the first aspect of the present application, a battery housing is provided. At least one heat conducting part is arranged inside the battery housing. The at least one heat conducting part divides the inside of the battery housing into at least two accommodating cavities. Two adjacent accommodating cavities are communicated with each other, and each accommodating cavity is used for accommodating an electrode assembly.

[0006] Optionally, the heat conducting part is connected to the inner wall of the battery housing, and there is at least one gap between the heat conducting part and the inner wall of the battery housing to communicate two adjacent accommodating cavities.

[0007] Optionally, the heat conducting part is connected to two opposite inner side walls of the battery housing. There is a first gap between the bottom of the heat conducting part and the inner bottom wall of the battery housing and / or a second gap between the top of the heat conducting part and the top of the battery housing.

[0008] Optionally, the sizes of the first gap and the second gap are the same, and the ratio of the height of the heat conducting part to the height of the battery housing is 1-2:3.

[0009] Optionally, the bottom of the heat conducting part is connected to the inner bottom wall of the battery housing. There is a third gap between the side wall of the heat conducting part and the side wall of the battery housing and / or a second gap between the top of the heat conducting part and the top of the battery housing.

[0010] Optionally, the ratio of the height of the heat conduction part to the height of the battery housing is 0.5 to 0.8:1, and / or the ratio of the width of the heat conduction part to the width of the battery housing is 0.5 to 0.8:1.

[0011] Optionally, the heat conduction part includes a first heat conduction member and a second heat conduction member. Both the first heat conduction member and the second heat conduction member are connected to the inner wall of the battery housing. The first heat conduction member and the second heat conduction member are integrally connected or there is a gap between the first heat conduction member and the second heat conduction member.

[0012] Optionally, the first heat conduction member is connected to the inner bottom wall of the battery housing, and there is a gap between the side wall of the first heat conduction member and the side wall of the battery housing. The second heat conduction member is connected to two opposite inner side walls of the battery housing, and the first heat conduction member is located between the second heat conduction member and the inner bottom wall of the battery housing.

[0013] Based on the same inventive concept, a second aspect of the present application provides a battery cell, including the battery housing according to any one of the above first aspects, an electrode assembly disposed in the accommodation cavity, a top cover connected to the battery housing and closing the accommodation cavity, and an electrolyte filled in the accommodation cavity; wherein, the electrolytes in any two adjacent accommodation cavities can flow through each other.

[0014] Based on the same inventive concept, a third aspect of the present application provides a battery, including a box body and at least one battery cell according to the above second aspect disposed in the box body.

[0015] As can be seen from the above, for the battery housing, battery cell and battery provided by the present application, at least one heat conduction part is provided in the battery housing, and the at least one heat conduction part divides the interior of the battery housing into at least two accommodation cavities, and each accommodation cavity is used for accommodating an electrode assembly. In actual application, when the electrode assembly is placed in the accommodation cavity, the setting of the heat conduction part can effectively reduce the temperature of the electrode assembly located in the accommodation cavity, improve the service life of the electrode assembly. At the same time, the communication between two adjacent accommodation cavities enables the electrolytes in the adjacent accommodation cavities to flow through each other, so that the amount of electrolytes in the adjacent accommodation cavities remains consistent, improving the capacity consistency of the electrode assemblies in the adjacent accommodation cavities. In addition, the heat conduction part is disposed between two adjacent electrode assemblies, which can increase the firmness of the fixation of the electrode assembly in the battery housing and prevent the electrode assembly from shaking. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a first exemplary structural schematic diagram of the battery housing according to the embodiment of the present application;

[0018] Figure 2 It is an exemplary exploded structural schematic diagram of the battery cell according to the embodiment of the present application;

[0019] Figure 3 It is a first exemplary sectional schematic diagram of the battery housing according to the embodiment of the present application;

[0020] Figure 4 It is a second exemplary sectional schematic diagram of the battery housing according to the embodiment of the present application;

[0021] Figure 5 It is a third exemplary sectional schematic diagram of the battery housing according to the embodiment of the present application;

[0022] Figure 6 It is a fourth exemplary sectional schematic diagram of the battery housing according to the embodiment of the present application;

[0023] Figure 7 It is a fifth exemplary sectional schematic diagram of the battery housing according to the embodiment of the present application;

[0024] Figure 8 It is a sixth exemplary sectional schematic diagram of the battery housing according to the embodiment of the present application;

[0025] Figure 9 It is an exemplary structural schematic diagram of the battery cell according to the embodiment of the present application;

[0026] Figure 10 It is a schematic diagram of the test result of the cycle temperature of the battery cell;

[0027] Figure 11 It is a schematic diagram of the test result of the cycle capacity retention rate of the battery cell.

[0028] In the figure: 1. Battery housing; 11. Accommodating cavity; 2. Heat conduction part; 21. First heat conduction member; 22. Second heat conduction member; 3. First gap; 4. Second gap; 5. Third gap; 6. Top cover; 61. Electrode terminal; 7. Electrode assembly; 71. Tab; 72. Core center heat area. Detailed implementation manners

[0029] To make the objectives, technical solutions, and advantages of this application clearer and more understandable, the following further elaborates on this application in detail with reference to specific embodiments and the accompanying drawings.

[0030] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the embodiments of this application should have the ordinary meanings understood by those with ordinary skills in the field to which this application belongs. The "first", "second", and similar terms used in this application do not denote any order, quantity, or importance, but are only used to distinguish different components. Words such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0031] With the continuous implementation of cost reduction in the market, each battery enterprise further launches batteries with even larger capacities (capacity > 500 Ah) based on a 300 Ah battery capacity. As the battery capacity increases, the thickness, width, and height of existing batteries will all increase to a certain extent, thereby increasing the battery volume.

[0032] As the battery volume increases, problems such as the shaking of the battery cells inside the battery, battery swelling, and heat dissipation inside the battery gradually become prominent. The industry has been committed to improving the heat dissipation performance and fixing firmness of large-capacity batteries.

[0033] In related technologies, a fixing plate is set at the bottom of the battery cell, and the fixing plate is extended into the winding core to achieve the fixation and internal heat dissipation of the winding core. However, in this way, during the manufacturing process, the fixing plate needs to be extended into the winding core, which is inconvenient for operation, and both the top cover and the bottom need to be welded, increasing the manufacturing process and cost.

[0034] In some other related technologies, the heat conduction performance of the battery is increased by adding gaps at the bottom of the battery housing. However, this will cause the bottom of the battery housing to be in a separated state, and it is easy to have inconsistent amounts of electrolyte in the cavities on both sides of the gap, thereby resulting in differences in the capacity performance of the electrode assemblies on both sides of the gap during battery use, manifested as poor capacity consistency after the battery has been used for a period of time.

[0035] Based on this, this application provides a battery housing, a battery cell, and a battery, which can improve the heat dissipation performance of the battery and the fixing firmness of the battery cells.

[0036] Figure 1Fig. 0 shows a first exemplary structural schematic diagram of the battery housing 1 provided by the present application. Figure 2 Fig. 2 shows a disassembled structural schematic diagram of the battery housing 1 provided by the present application after being assembled into a battery cell.

[0037] As Figure 1 and Figure 2 shown, the present application provides a battery housing 1, in which at least one heat-conducting part 2 is provided. The at least one heat-conducting part 2 divides the interior of the battery housing 1 into at least two accommodation chambers 11, and two adjacent accommodation chambers 11 are communicated with each other. Each accommodation chamber 11 is used for accommodating an electrode assembly 7.

[0038] Specifically, the battery housing 1 can be a hollow housing with one end open, and at least one heat-conducting part 2 is provided inside the battery housing 1. The heat-conducting part 2 can optionally be made of the same heat-conducting metal material as the battery housing 1. Exemplarily, the heat-conducting part 2 can be made of at least one of aluminum, steel, and alloy.

[0039] The heat-conducting part 2 can be in a plate-like structure, a sheet-like structure, etc., and the specific structure of the heat-conducting part 2 is not limited herein.

[0040] The at least one heat-conducting part 2 divides the interior of the battery housing 1 into at least two accommodation chambers 11, and each accommodation chamber 11 is used for accommodating an electrode assembly 7. That is, a heat-conducting part 2 is provided between two adjacent electrode assemblies 7. In this way, on the one hand, the heat-conducting part 2 can effectively reduce the temperature of the electrode assembly 7 located in the accommodation chamber 11 and improve the service life of the electrode assembly 7. On the other hand, it can play a role in fixing the electrode assembly 7 and prevent the electrode assembly 7 from shaking.

[0041] The communication between two adjacent accommodation chambers 11 can enable the electrolyte in the adjacent accommodation chambers 11 to flow through each other, so that the amount of electrolyte in the adjacent accommodation chambers 11 is kept consistent, and the capacity consistency of the electrode assemblies 7 in the adjacent accommodation chambers 11 is improved.

[0042] In the present application, by only providing at least one heat-conducting part 2 inside the battery housing 1, on the one hand, the temperature of the electrode assembly 7 can be effectively reduced, and the service life of the battery can be extended. On the other hand, the fixation of the electrode assembly 7 inside the battery housing 1 can be realized, the shaking of the electrode assembly 7 can be reduced, and the strength of the battery can also be enhanced, reducing the possibility of deformation of the battery housing 1 during use.

[0043] Moreover, the communication between two adjacent accommodation chambers 11 can enable two adjacent electrode assemblies 7 to be in the same electrolyte environment, ensuring the consistency of the two adjacent electrode assemblies 7 during use.

[0044] In some embodiments, the heat conducting part 2 is connected to the inner wall of the battery housing 1, and there is at least one gap between the heat conducting part 2 and the inner wall of the battery housing 1 to communicate two adjacent accommodation cavities 11 with each other.

[0045] Specifically, the heat conducting part 2 can be connected to one or more inner side walls of the battery housing 1, or can be connected to the inner bottom wall of the battery housing 1, so as to fix the heat conducting part 2 to the battery housing 1, ensure the firmness of the heat conducting part 2, and further enable the heat conducting part 2 to play a role in restricting the shaking of the electrode assembly 7.

[0046] Among them, the connection between the heat conducting part 2 and the battery housing 1 can be integrally stamped, or can be welded. Welding can be carried out by means of laser welding, electron beam welding, resistance welding, arc welding, plasma arc welding, etc., and the specific connection method is not limited.

[0047] There is at least one gap between the heat conducting part 2 and the inner wall of the battery housing 1 to communicate two adjacent accommodation cavities 11 with each other. Thus, in specific implementation, the communication between two adjacent accommodation cavities 11 enables the electrolyte between two adjacent accommodation cavities 11 to flow mutually, and further enables the electrolyte amounts in adjacent accommodation cavities 11 to be kept consistent, and improves the capacity consistency of the electrode assemblies 7 in adjacent accommodation cavities 11.

[0048] In some embodiments, referring to Figure 3 and Figure 4 shown, Figure 3 FIG. 1 shows a first exemplary sectional schematic diagram of the battery housing 1 provided by the present application, Figure 4 FIG. 2 shows a second exemplary sectional schematic diagram of the battery housing 1 provided by the present application.

[0049] As Figure 3 and Figure 4 shown, the heat conducting part 2 is connected to two opposite inner side walls of the battery housing 1, and there is a first gap 3 between the bottom of the heat conducting part 2 and the inner bottom wall of the battery housing 1 and / or there is a second gap 4 between the top of the heat conducting part 2 and the top of the battery housing 1.

[0050] Specifically, the heat conducting part 2 can be connected to two opposite inner side walls of the battery, and the connection between the heat conducting part 2 and the two inner side walls can be integrally stamped, or can be welded.

[0051] There are three situations for there being a first gap 3 between the bottom of the heat conducting part 2 and the inner bottom wall of the battery housing 1 and / or there being a second gap 4 between the top of the heat conducting part 2 and the top of the battery housing 1:

[0052] The first case: There is a first gap 3 between the bottom of the heat-conducting part 2 and the inner bottom wall of the battery housing 1, and there is no gap between the top of the heat-conducting part 2 and the top of the battery housing 1. At this time, the bottoms of two adjacent accommodating cavities 11 are communicated through the first gap 3, and the electrolytes of two adjacent accommodating cavities 11 can flow through the first gap 3. At this time, the battery housing 1 is applicable to the case where the electrode assembly 7 is placed upright. At this time, the bottoms of two adjacent electrode assemblies 7 are in the same electrolyte environment, ensuring the capacity consistency of the two.

[0053] The second case: There is no gap between the bottom of the heat-conducting part 2 and the inner bottom wall of the battery housing 1, and there is a second gap 4 between the top of the heat-conducting part 2 and the top of the battery housing 1. In specific implementation, a top cover may be provided on the top of the battery housing 1 to seal the battery housing 1. At this time, the tops of two adjacent accommodating cavities 11 are communicated through the second gap 4, and the electrolytes of two adjacent accommodating cavities 11 can flow through the second gap 4. At this time, the battery housing 1 is applicable to the case where the electrode assembly 7 is placed upside down.

[0054] The third case: There is a first gap 3 between the bottom of the heat-conducting part 2 and the inner bottom wall of the battery housing 1 and there is a second gap 4 between the top of the heat-conducting part 2 and the top of the battery housing 1. At this time, two adjacent accommodating cavities 11 can be communicated through the first gap 3 and / or the second gap 4, and the electrolytes of two adjacent accommodating cavities 11 can flow through the first gap 3 and / or the second gap 4. At this time, the battery housing 1 is applicable to the case where the electrode assembly 7 is placed upright or upside down, and the applicable range is wider.

[0055] When there is a first gap 3 between the bottom of the heat-conducting part 2 and the inner bottom wall of the battery housing 1 and there is a second gap 4 between the top of the heat-conducting part 2 and the top of the battery housing 1, the ratio of the size of the first gap 3 to the size of the second gap 4 can be 0.5 - 2:1. In this way, the sizes of the first gap 3 and the second gap 4 are appropriate, facilitating the flow of the electrolyte at both the bottom and the top (when the battery cell is used upside down) of the battery housing 1, and further enabling the electrode assembly 7 to be in the same electrolyte environment, improving the consistency of adjacent electrode assemblies 7.

[0056] Exemplarily, the ratio of the size of the first gap 3 to the size of the second gap 4 can be 0.5:1, 1:1, 1.5:1, 2:1, etc. When the battery housing 1 is of the structure as Figure 3 shown, the size can be the height.

[0057] In this application, the heat-conducting part 2 is connected to both of the two inner side walls opposite to the battery housing 1, thus ensuring the firmness of the connection of the heat-conducting part 2, enabling the heat-conducting part 2 to limit the shaking of two adjacent electrode assemblies 7. Moreover, there is a first gap 3 between the bottom of the heat-conducting part 2 and the inner bottom wall of the battery housing 1 and / or a second gap 4 between the top of the heat-conducting part 2 and the top of the battery housing 1, which can not only ensure the communication between two adjacent accommodation cavities 11, but also improve the applicability flexibility of this battery housing 1, making it applicable to the situation where the electrode assembly 7 is placed upright or inverted.

[0058] Continue to refer to Figure 2 As shown, since the heat generation at the middle position of the electrode assembly 7 is the largest, the heat conduction is poor, and the heat conduction efficiency is low, this part of the middle position of the electrode assembly 7 is called the core center heat area 72. Therefore, in order to effectively reduce the temperature of the electrode assembly 7 and improve the heat dissipation performance of the electrode assembly 7, in this application, the heat-conducting part 2 covers at least part of the core center heat area 72. Further, the heat-conducting part 2 completely covers the core center heat area 72.

[0059] In some embodiments, continue to refer to Figure 3 As shown, the sizes of the first gap 3 and the second gap 4 are the same, and the ratio of the height of the heat-conducting part 2 to the height of the battery housing 1 is 1-2:3.

[0060] Specifically, the sizes of the first gap 3 and the second gap 4 are the same, so that the heat-conducting part 2 is located at the middle position of the battery housing 1 in the height direction (such as the direction indicated by H in Figure 3 ), thereby enabling the heat-conducting part 2 to at least partially cover the area of the core center heat area 72 of the electrode assembly 7 in the height direction. At the same time, on the premise that the heat-conducting part 2 is located at the middle position in the height direction, the heat-conducting part 2 is connected to the two opposite inner side walls of the battery housing 1, so that the heat-conducting part 2 can completely cover all areas of the electrode assembly 7 in the width direction (such as the direction indicated by W in Figure 3 ).

[0061] In this way, the heat-conducting part 2 can at least partially cover the area of the core center heat area 72 in the height direction and can also completely cover all areas of the electrode assembly 7 in the width direction, so that the setting of the heat-conducting part 2 can effectively reduce the temperature of the electrode assembly 7 and improve the heat dissipation performance.

[0062] Further, the ratio of the height of the heat-conducting part 2 to the height of the battery housing 1 is 1-2:3, so that the height of the heat-conducting part 2 is appropriate, and the heat-conducting part 2 can completely cover the area of the core center heat area 72 of the electrode assembly 7 in the height direction, thereby efficiently reducing the temperature of the electrode assembly 7 and improving the heat dissipation performance.

[0063] Exemplarily, the ratio of the height of the heat conduction part 2 to the height of the battery housing 1 can be 1:3, 1.5:3, 2:3, etc.

[0064] In some embodiments, referring to Figure 5 and Figure 6 as shown, Figure 5 FIG. shows a third exemplary cross-sectional view of the battery housing 1 provided by the present application, Figure 6 FIG. shows a fourth exemplary cross-sectional view of the battery housing 1 provided by the present application.

[0065] As Figure 5 and Figure 6 shown, the bottom of the heat conduction part 2 is connected to the inner bottom wall of the battery housing 1, and there is a third gap 5 between the side wall of the heat conduction part 2 and the side wall of the battery housing 1 and / or there is a second gap 4 between the top of the heat conduction part 2 and the top of the battery housing 1.

[0066] Specifically, the heat conduction part 2 includes four heat conduction side walls, the battery housing 1 includes four inner side walls, the four heat conduction side walls correspond to the four inner side walls one by one, and there is a third gap 5 between the heat conduction side wall and the corresponding inner side wall. Further, the size of the third gap 5 between each pair of opposite heat conduction side walls and the corresponding inner side wall is the same, so that the heat conduction part 2 is located at the middle position of the battery housing 1 in the width direction (such as Figure 5 the W direction shown), and further the heat conduction part 2 at least partially covers the core center heat area 72 of the electrode assembly 7, thereby effectively reducing the temperature of the electrode assembly 7 and improving the heat dissipation performance.

[0067] Further, the ratio of the height of the heat conduction part 2 to the height of the battery housing 1 is 0.5 - 0.8:1, so that the height of the heat conduction part 2 is appropriate, and the heat conduction part 2 can completely cover the area of the core center heat area 72 of the electrode assembly 7 in the height direction ( Figure 5 the direction shown as H in), thereby reducing the temperature of the electrode assembly 7 and improving the heat dissipation performance.

[0068] The ratio of the width of the heat conduction part 2 to the width of the battery housing 1 is 0.5 - 0.8:1, so that the width of the heat conduction part 2 is appropriate, and the heat conduction part 2 can completely cover the area of the core center heat area 72 of the electrode assembly 7 in the width direction ( Figure 5 the direction shown as W in), thereby reducing the temperature of the electrode assembly 7 and improving the heat dissipation performance.

[0069] In this way, the heat conduction part 2 can completely cover the core center heat area 72 of the electrode assembly 7, so that the heat conduction part 2 can efficiently reduce the temperature of the electrode assembly 7 and improve the heat dissipation performance.

[0070] Exemplarily, the ratio of the height of the heat conducting part 2 to the height of the battery housing 1 can be 0.5:1, 0.6:1, 0.7:1, 0.8:1, etc. The ratio of the width of the heat conducting part 2 to the width of the battery housing 1 can be 0.5:1, 0.6:1, 0.7:1, 0.8:1, etc.

[0071] In some embodiments, referring to Figure 7 and Figure 8 , Figure 7 shows a fifth exemplary cross-sectional schematic diagram of the battery housing 1 provided by the present application, Figure 8 shows a sixth exemplary cross-sectional schematic diagram of the battery housing 1 provided by the present application.

[0072] As Figure 7 and Figure 8 shown, the heat conducting part 2 includes a first heat conducting member 21 and a second heat conducting member 22. Both the first heat conducting member 21 and the second heat conducting member 22 are connected to the inner wall of the battery housing 1. The first heat conducting member 21 and the second heat conducting member 22 are integrally connected or there is a gap between the first heat conducting member 21 and the second heat conducting member 22.

[0073] Specifically, both the first heat conducting member 21 and the second heat conducting member 22 are connected to the inside of the battery housing 1. The positions where the first heat conducting member 21 and the second heat conducting member 22 are connected to the battery housing 1 can be the same or different. Exemplarily, both the first heat conducting member 21 and the second heat conducting member 22 can be connected to the inner side wall of the battery housing 1, or one of them can be connected to the inner side wall of the battery housing 1 and the other can be connected to the inner bottom wall of the battery housing 1.

[0074] The first heat conducting member 21 and the second heat conducting member 22 can be integrally connected, that is, there is no gap between the first heat conducting member 21 and the second heat conducting member 22. Or, there can be a gap between the first heat conducting member 21 and the second heat conducting member 22, and the specific setting is not limited and is set according to actual needs.

[0075] In the present application, the first heat conducting member 21 and the second heat conducting member 22 can be arranged at different positions inside the battery housing 1 according to actual needs, so as to further reduce the temperature of the electrode assembly 7 and improve the heat dissipation performance.

[0076] In some embodiments, continuing to refer to Figure 7 and Figure 8 shown, the first heat conducting member 21 is connected to the inner bottom wall of the battery housing 1, there is a gap between the side wall of the first heat conducting member 21 and the side wall of the battery housing 1, the second heat conducting member 22 is connected to two opposite inner side walls of the battery housing 1, and the first heat conducting member 21 is located between the second heat conducting member 22 and the inner bottom wall of the battery housing 1.

[0077] Specifically, the first heat conducting member 21 is connected to the inner bottom wall of the battery housing 1 , and there is a gap between the side wall of the first heat conducting member 21 and the inner side wall of the battery housing 1 , so that two adjacent accommodating cavities 11 can be connected.

[0078] The gaps between the two opposite side walls of the first heat-conducting member 21 and the corresponding inner wall of the battery housing 1 are the same, so that the first heat-conducting member 21 is located in the middle position of the battery housing 1 in the width direction, so that the first heat-conducting member 21 can more effectively reduce the temperature of the middle position of the electrode assembly 7.

[0079] Furthermore, the ratio of the width of the first heat-conducting member 21 to the width of the battery housing 1 is 0.4-0.6:1, which can ensure that the gap between the side wall of the first heat-conducting member 21 and the inner wall of the battery housing 1 is sufficient to facilitate the circulation of the electrolyte, and can also ensure that the width of the first heat-conducting member 21 is wide enough to improve the heat dissipation performance.

[0080] The ratio of the height of the first heat conductor 21 to the height of the battery housing 1 is 0.2-0.5:1, so that the first heat conductor 21 is located at the lower part of the battery housing 1 to reduce the temperature of the lower part of the electrode assembly 7 as much as possible, while reserving installation space for the second heat conductor 22.

[0081] The second heat conductor 22 located above the first heat conductor 21 can be used to reduce the temperature of the middle and upper parts of the electrode assembly 7. The combination of the first heat conductor 21 and the second heat conductor 22 allows the heat conducting part 2 to cover as much of the area of ​​the electrode assembly 7 in the height direction as possible.

[0082] At the same time, the second heat conducting member 22 is connected to two opposite inner side walls of the battery housing 1 , so that the second heat conducting member 22 can completely cover the entire area of ​​the electrode assembly 7 in the width direction.

[0083] In this way, the combination of the first heat conductor 21 and the second heat conductor 22 can cover most of the area in the height direction and the entire area in the width direction of the electrode assembly 7, which can comprehensively reduce the temperature at various positions of the electrode assembly 7, avoid local overheating of the electrode assembly 7, and improve the heat dissipation performance.

[0084] In some embodiments, the thickness of the heat conducting part can be adjusted according to the size of the electrode assembly 7, the heat generated and the thickness of the side of the battery housing 1. Generally, a large battery cell generates more heat, so the thickness of the heat conducting part can be thicker. Exemplarily, the thickness of the heat conducting part can be 0.2 to 1 mm.

[0085] In some embodiments, the wall thickness, width, height, etc. of the battery housing 1 are set according to actual requirements. Exemplarily, the wall thickness of the battery housing 1 can be 20 - 90 mm, the width of the battery housing 1 can be 140 - 400 mm, and the height of the battery housing 1 can be 80 - 300 mm.

[0086] In some embodiments, referring to Figure 9 , Figure 9 shows an exemplary structural schematic diagram of the battery cell provided by the present application. As Figure 9 shown, the battery cell provided by the present application includes the battery housing 1 described in any of the above embodiments, an electrode assembly 7 disposed in the accommodation cavity 11, a top cover 6 connected to the battery housing 1 and closing the accommodation cavity 11, and an electrolyte filled in the accommodation cavity 11; wherein, the electrolytes in any two adjacent accommodation cavities 11 can flow through each other.

[0087] Specifically, the battery cell can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell can be in a cylindrical shape, a flat shape, a cuboid shape or other shapes, etc.

[0088] Continuing to refer to Figure 2 the exemplary exploded structural schematic diagram of the battery cell shown. A battery cell refers to the smallest unit that makes up a battery. As Figure 2 shown, the battery cell includes a top cover 6, a battery housing 1, an electrode assembly 7, an electrolyte (not shown in the figure) and other functional components (not shown in the figure).

[0089] The top cover 6 refers to a component that covers the opening of the battery housing 1 to isolate the internal environment of the battery cell from the external environment. Without limitation, the shape of the top cover 6 can be adapted to the shape of the battery housing 1 to cooperate with the battery housing 1. Optionally, the top cover 6 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the top cover 6 is not easily deformed when being squeezed or collided, enabling the battery cell to have higher structural strength and the safety performance can also be improved.

[0090] Functional components such as electrode terminals 61 can be provided on the top cover 6. The electrode terminals 61 are used to electrically connect to the electrode assembly 7 for outputting or inputting the electrical energy of the battery cell.

[0091] In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold can also be provided on the top cover 6. The material of the top cover 6 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereto.

[0092] In some embodiments, an insulating member may further be provided inside the top cover 6. The insulating member can be used to isolate the electrical connection components in the battery housing 1 from the top cover 6 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0093] The electrode assembly 7 is a component in the battery cell where an electrochemical reaction occurs. The electrode assembly 7 is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet having active materials constitute the main body portion of the electrode assembly 7, and the portions of the positive electrode sheet and the negative electrode sheet not having active materials respectively constitute the electrode tabs 71. The positive electrode tab 71 and the negative electrode tab 71 can be located at one end of the main body portion together or at both ends of the main body portion respectively. During the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the electrode tabs 71 are connected to the electrode terminals 61 to form a current loop.

[0094] The battery housing 1 is a component for cooperating with the top cover 6 to form the internal environment of the battery cell, wherein the formed internal environment can be used to accommodate the electrode assembly 7 and the electrolyte.

[0095] The battery housing 1 and the top cover 6 can be independent components. An opening can be provided on the battery housing 1, and the top cover 6 is covered at the opening to form the internal environment of the battery cell. Without limitation, the top cover 6 and the battery housing 1 can also be integrated. Specifically, the top cover 6 and the battery housing 1 can first form a common connection surface before other components are put into the housing, and when it is necessary to encapsulate the inside of the battery housing 1, the top cover 6 is bent relative to the battery housing 122 and covers the battery housing 1. The battery housing 1 can be in various shapes and sizes, such as rectangular parallelepiped shape, cylindrical shape, hexagonal prism shape, etc. Specifically, the shape of the battery housing 1 can be determined according to the specific shape and size of the electrode assembly 7. The material of the battery housing 1 can be various, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations on this.

[0096] In the present application, the electrolytes in any two adjacent accommodating cavities 11 can flow into each other, so that any two adjacent electrode assemblies 7 can be in the same electrolyte environment, improving the capacity consistency of adjacent electrode assemblies 7.

[0097] The present application also provides a battery, including a box body and at least one battery cell as described in any of the above embodiments provided in the box body.

[0098] Specifically, in a battery, there can be multiple battery cells. The multiple battery cells can be connected in series, parallel, or in a combined series-parallel connection. A combined series-parallel connection means that there are both series and parallel connections among the multiple battery cells. The multiple battery cells can be directly connected in series, parallel, or in a combined series-parallel connection and then the whole formed by the multiple battery cells is accommodated in a box body. Of course, the battery can also be that multiple battery cells are first connected in series, parallel, or in a combined series-parallel connection to form a battery module, and then multiple battery modules are connected in series, parallel, or in a combined series-parallel connection to form a whole and are accommodated in a box body. The battery can also include other structures. For example, the battery can also include a busbar component for realizing the electrical connection among the multiple battery cells.

[0099] The battery has the technical effects described in any of the above embodiments and will not be elaborated here.

[0100] The technical effects of the present application will be further described below through embodiments and comparative examples.

[0101] Use a conventional shell (i.e., the battery shell 1 without the heat conduction part 2) and the battery shell 1 described in the present application (hereinafter referred to as "heat conduction shell") to prepare corresponding battery cells.

[0102] When manufacturing the battery cell, a temperature sensing wire is arranged at the central position of the electrode assembly 7 to collect the dimension at the central position of the electrode assembly 7, and the difference between the temperature at the central position of the electrode assembly 7 in the conventional shell (hereinafter referred to as "conventional JR central temperature", JR is the electrode assembly 7) and the temperature at the central position of the electrode assembly 7 in the heat conduction shell (hereinafter referred to as "heat conduction JR central temperature") is compared. At the same time, the temperature of the outer side wall of the battery shell 1 is detected.

[0103] For the two prepared battery cells, the test results of the cycle temperature obtained by 1C / 1C cycle test are shown in Figure 10 As shown. It can be seen from Figure 10 that for the battery cell without the heat conduction part 2, the temperature at the middle position of the electrode assembly 7 (i.e., the conventional JR central temperature) is much higher than the temperature of the outer side wall of the shell (i.e., the temperature of the side of the conventional shell), while for the battery cell with the heat conduction part 2, the difference between the temperature at the middle position of the electrode assembly 7 (i.e., the heat conduction JR central temperature) and the temperature of the outer side wall of the shell (i.e., the temperature of the side of the heat conduction shell) is very small, and the heat conduction JR central temperature is significantly lower than the conventional JR central temperature. This shows that the setting of the heat conduction part 2 can quickly transfer the heat of the electrode assembly 7 to the battery shell 1 to reduce the temperature of the electrode assembly 7 and effectively control the internal temperature of the battery cell.

[0104] For the two prepared battery cells, the test results of the cycle capacity retention rate are shown in Figure 11 As shown. It can be seen from Figure 11It can be seen that when comparing the two groups of battery cells, at the initial stage of cycling, the increase in the temperature of the electrode assembly 7 is beneficial to the battery capacity performance. Since the central temperature of the electrode assembly 7 in the conventional case is relatively high, its capacity performance is relatively high. As the cycling continues to 1500 cycles, the central temperature of its electrode assembly 7 gradually increases, and the capacity attenuation of the conventional battery cell is relatively obvious in the later stage of cycling (after 1500 cls). This is because, in the later stage of cycling, the influence of temperature on the battery cell life gradually becomes prominent. The increase in temperature accelerates the side reactions, which in turn leads to the shortening of the battery cell life, manifested as a significant reduction in its capacity retention rate.

[0105] For the heat-conducting battery cell provided with the heat-conducting part 2, due to the setting of the heat-conducting part 2, the central temperature of its electrode assembly 7 is relatively low, so its initial capacity performance is slightly lower. As the cycling continues to 1500 cycles, since the central temperature of its electrode assembly 7 is still relatively low (the heat is transferred in time by the heat-conducting part 2), the side reactions caused by the increase in temperature are not obvious, and thus its capacity attenuation is not obvious either. Therefore, in the later stage of cycling, the capacity retention rate of the battery cell provided with the heat-conducting part 2 is higher than that of the battery cell without the heat-conducting part 2, and the difference between the two gradually increases. It can be seen that by setting the heat-conducting part 2 and controlling the internal temperature of the battery cell, the service life of the battery cell can be effectively extended.

[0106] In summary, for the battery housing 1, battery cell and battery provided in the present application, during actual application, when the electrode assembly 7 is placed in the accommodation cavity 11, the setting of the heat-conducting part 2 can effectively reduce the temperature of the electrode assembly 7 located in the accommodation cavity 11, improve the service life of the electrode assembly 7. At the same time, the communication between two adjacent accommodation cavities 11 enables the electrolytes in the adjacent accommodation cavities 11 to flow mutually, so that the electrolyte amounts in the adjacent accommodation cavities 11 are kept consistent, improving the capacity consistency of the electrode assemblies 7 in the adjacent accommodation cavities 11. In addition, the heat-conducting part 2 is arranged between two adjacent electrode assemblies 7, which can increase the fixing firmness of the electrode assembly 7 in the battery housing 1 and prevent the electrode assembly 7 from shaking.

[0107] Those of ordinary skill in the art should understand that: the discussion of any embodiment above is only exemplary and is not intended to imply that the scope of the present application (including the claims) is limited to these examples; under the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present application as described above, which are not provided in detail for the sake of brevity.

[0108] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery housing, characterized in that: At least one heat-conducting part is provided in the battery shell, and the at least one heat-conducting part divides the interior of the battery shell into at least two accommodating cavities, and two adjacent accommodating cavities are connected. Each of the accommodating cavities is used to accommodate an electrode assembly. The heat-conducting part is connected to the inner wall of the battery shell, and there is at least one gap between the heat-conducting part and the inner side wall or inner bottom wall of the battery shell so that the bottoms of two adjacent accommodating cavities are connected. The heat-conducting part is a plate-like structure or a sheet-like structure.

2. The battery housing according to claim 1, characterized in that: The heat conducting part is connected to two opposite inner side walls of the battery housing, a first gap is formed between the bottom of the heat conducting part and the inner bottom wall of the battery housing and / or a second gap is formed between the top of the heat conducting part and the top of the battery housing.

3. The battery housing according to claim 2, characterized in that: The first gap and the second gap have the same size, and the ratio of the height of the heat conducting portion to the height of the battery housing is 1 to 2:

3.

4. The battery housing according to claim 1, characterized in that: The bottom of the heat conducting part is connected to the inner bottom wall of the battery housing, a third gap is formed between the side wall of the heat conducting part and the side wall of the battery housing, and / or a second gap is formed between the top of the heat conducting part and the top of the battery housing.

5. The battery casing according to claim 4, characterized in that: The ratio of the height of the heat conducting portion to the height of the battery housing is 0.5 to 0.8:1, and / or the ratio of the width of the heat conducting portion to the width of the battery housing is 0.5 to 0.8:

1.

6. The battery case according to claim 1, characterized in that: The heat conducting part includes a first heat conducting member and a second heat conducting member, both of which are connected to the inner wall of the battery housing, and the first heat conducting member and the second heat conducting member are integrally connected or there is a gap between the first heat conducting member and the second heat conducting member.

7. The battery casing according to claim 6, characterized in that: The first heat-conducting member is connected to the inner bottom wall of the battery housing, and there is a gap between the side wall of the first heat-conducting member and the side wall of the battery housing. The second heat-conducting member is connected to two opposite inner side walls of the battery housing, and the first heat-conducting member is located between the second heat-conducting member and the inner bottom wall of the battery housing.

8. A battery cell, characterized in that: It comprises a battery case as described in any one of claims 1 to 7, an electrode assembly arranged in the accommodating cavity, a top cover connected to the battery case and closing the accommodating cavity, and an electrolyte filled in the accommodating cavity; wherein the electrolytes in any two adjacent accommodating cavities can flow with each other.

9. A battery, characterized in that: The invention comprises a box body and at least one battery cell as claimed in claim 8 arranged in the box body.

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